Swedish-Swiss company Siemens is modernising 15 converter transformers at the Songo converter station at the Cahora Bassa dam in Mozambique, under a Euro 26 million order from Hidroeléctrica de Cahora Bassa. The converter station is part of a 1,920 MW high voltage direct current transmission link built in the 1970s to transport electricity over a 1,450 km distance. The rehabilitation is essential to enable the transformers to continue operating reliably. Siemens will perform a comprehensive service retrofit of the transformers, which are of various voltage series and construction types. This includes maintenance and induced repair of the tap changer, and replacing the bushings and several winding sets. Siemens will take three years to complete the project.
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